Semiconductor device and a method of manufacturing a semiconductor device

ABSTRACT

In one example, a semiconductor package comprises a substrate having a top surface and a bottom surface, an electronic device mounted on the top surface of the substrate and coupled to one or more interconnects on the bottom surface of the substrate, a cover over the electronic device, a casing around a periphery of the cover, and an encapsulant between the cover and the casing and the substrate.

TECHNICAL FIELD

The present disclosure relates, in general, to electronic devices, andmore particularly, to semiconductor devices and methods formanufacturing semiconductor devices.

BACKGROUND

Prior semiconductor packages and methods for forming semiconductorpackages are inadequate, for example resulting in excess cost, decreasedreliability, relatively low performance, or package sizes that are toolarge. Further limitations and disadvantages of conventional andtraditional approaches will become apparent to one of skill in the art,through comparison of such approaches with the present disclosure andreference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a cross-sectional view of an example semiconductor device.

FIGS. 2A to 2L show cross-sectional views of an example method formanufacturing an example semiconductor device.

FIGS. 3A to 3D show cross-sectional views of another example method formanufacturing a semiconductor device.

FIG. 4 shows a cross-sectional view of another example of asemiconductor device.

FIGS. 5A to 5L show cross-sectional views of another example method formanufacturing a semiconductor device.

FIGS. 6A to 6D show cross-sectional views of another example method formanufacturing a semiconductor device.

The following discussion provides various examples of semiconductordevices and methods of manufacturing semiconductor devices. Suchexamples are non-limiting, and the scope of the appended claims shouldnot be limited to the particular examples disclosed. In the followingdiscussion, the terms “example” and “e.g.” are non-limiting.

The figures illustrate the general manner of construction, anddescriptions and details of well-known features and techniques may beomitted to avoid unnecessarily obscuring the present disclosure. Inaddition, elements in the drawing figures are not necessarily drawn toscale. For example, the dimensions of some of the elements in thefigures may be exaggerated relative to other elements to help improveunderstanding of the examples discussed in the present disclosure. Thesame reference numerals in different figures denote the same elements.It should be noted, however, that the scope of the disclosure and/or theclaimed subject matter is not limited in this respect.

The terms “and/or” include any single item, or any combination of theitems, in the list joined by “and/or”. As used in this disclosure, thesingular forms are intended to include the plural forms as well, unlessthe context clearly indicates otherwise. It should be noted, however,that the scope of the disclosure and/or the claimed subject matter isnot limited in this respect.

The terms “comprises,” “comprising,” “includes,” and/or “including,” are“open ended” terms and specify the presence of stated features, but donot preclude the presence or addition of one or more other features. Itshould be noted, however, that the scope of the disclosure and/or theclaimed subject matter is not limited in this respect.

The terms “first,” “second,” etc. may be used herein to describe variouselements, and these elements should not be limited by these terms. Theseterms are only used to distinguish one element from another. Thus, forexample, a first element discussed in this disclosure could be termed asecond element without departing from the teachings of the presentdisclosure. It should be noted, that the scope of the disclosure and/orthe claimed subject matter is not limited in this respect.

Unless specified otherwise, the term “coupled” may be used to describetwo elements directly contacting each other or describe two elementsindirectly connected by one or more other elements. For example, ifelement A is coupled to element B, then element A can be directlycontacting element B or indirectly connected to element B by anintervening element C. Similarly, the terms “over” or “on” may be usedto describe two elements directly contacting each other or describe twoelements indirectly connected by one or more other elements. It shouldbe noted, however, that the scope of the disclosure and/or the claimedsubject matter is not limited in this respect.

The terms “top” and “bottom” generally refer to opposite sides orsurfaces of a device, feature, or structure corresponding to theorientation of the device, feature, or structure as shown in one or moreof the drawing figures. In general, a top side or surface may refer to afirst side surface and a bottom side or surface, and a bottom side orsurface may refer to a second side or surface that is located oppositeto the first surface. It should be noted, however, that the scope of thedisclosure and/or the claimed subject matter is not limited in thisrespect.

The term “coplanar” may refer to two objects, sides of objects, surfacesof objects, and/or other features that lie in the same plane orgenerally in the same plane at least in part. In geometric terms, a setof points are coplanar if there is a geometric plane containing all thepoints. In general, two objects or structures may be referred to as“coplanar” when a surface, an end, a side, or a feature of each of thetwo objects or structures lies in a single plane at least in part.Furthermore, the term “planar” may refer to a surface that is planar ornearly planar within an acceptable tolerance. It should be noted,however, that the scope of the disclosure and/or the claimed subjectmatter is not limited in this respect.

The term “substantial” may refer to a portion that is greater than orequal to half, and/or may further refer to other portions, for examplesixty-percent or greater, seventy-percent or greater, eighty-percent orgreater, or ninety-percent or greater. In some embodiments, substantialmay also refer to 100% or greater, for example if a first structure isgreater in size and/or volume than a second structure, the firststructure may be over the second structure and may be considered ascovering a substantial portion of the second structure by the nature ofthe first structure covering more area and/or volume than the secondstructure and/or wherein the first structure at least partially exceedsbeyond an edge or boundary of the second structure. Furthermore, in someembodiments, substantial also may refer to a portion that is less than50%, for example where the portion is ample or sufficient in qualityand/or quantity. In yet other embodiments, substantial may mean all ornearly all. It should be noted, however, that the scope of thedisclosure and/or the claimed subject matter is not limited in thisrespect.

DESCRIPTION

The present description includes, among other features, examples of asemiconductor package such as a flip-chip chip scale package (fcCSP) andexample methods to form a flip-chip chip scale package. In a firstexample, a semiconductor package comprises a substrate having a topsurface and a bottom surface, an electronic device mounted on the topsurface of the substrate and coupled to one or more interconnects on thebottom surface of the substrate, a cover over the electronic device, anda casing around a periphery of the cover. An encapsulant can be betweenthe cover and the substrate, and/or between the casing and thesubstrate.

In a second example, a method to form a semiconductor package comprisesdisposing two or more semiconductor die on a top surface of a substrate,forming an encapsulant between the semiconductor die on the top surfaceof the substrate, attaching an array of covers over the two or moresemiconductor die wherein a cover of the array of covers can be over oneof the semiconductor die, wherein the array of covers includes a casingaround a periphery of each of the covers, and attaching two or moreinterconnects to a bottom surface of the substrate to electricallycouple the semiconductor die to the interconnects via the substrate toform a subassembly of the two or more semiconductor die. The subassemblyof the two or more semiconductor die can be singulated into individualsemiconductor packages by a saw operation that cuts the encapsulantbetween the die, wherein each of the individual semiconductor packagescomprises a cover over a semiconductor die and a substantial portion ofthe substrate, and one or more surfaces of the encapsulant can becoplanar with one or surfaces of the substrate and one or more surfacesof the casing.

In a third example, a method to form a semiconductor package comprisescoupling two or more semiconductor die to a substrate strip, disposingthe block array over the two or more semiconductor die, wherein a coverof the bock array is over one of the semiconductor die, and forming anencapsulant between a first semiconductor die and a second semiconductordie of the two or more semiconductor die. The substrate strip can besingulated into two or more semiconductor packages, wherein one covercan be over a semiconductor die and a substantial portion of thesubstrate, and wherein one or more surfaces of the encapsulant iscoplanar with one or more surfaces of the substrate and one or moresurfaces of the casing.

Other examples are included in the present disclosure. Such examples maybe found in the figures, in the claims, and/or in the description of thepresent disclosure.

FIG. 1 shows a cross-sectional view of an example semiconductor device100. In the example shown in FIG. 1, semiconductor device 100 cancomprise a substrate 110, an electronic device 120, an encapsulant 130,a cover 140, a casing 150 and interconnects 160.

Substrate 110 can comprise conductive structure 111 with one or moreconductive layers and dielectric structure 112 with one or moredielectric layers. Electronic device 120 can comprise interconnects 121.

Substrate 110, encapsulant 130, cover 140, casing 150, and interconnects160 can be referred to as a semiconductor package 190 and package 190can provide protection for electronic device 120 from external elementsand/or environmental exposure. In addition, semiconductor package 190can provide electrical coupling between external electrical components(not shown) and interconnects 160. As shown in FIG. 1 in addition tovarious other figures below, in one or more embodiments cover 140 isover a substantial portion of substrate 110. The term “substantial” mayrefer to a portion that is greater than or equal to half, and/or mayfurther refer to other portions, for example sixty-percent or greater,seventy-percent or greater, eighty-percent or greater, or ninety-percentor greater. In some embodiments, substantial may also refer to 100% orgreater, for example if a first structure is greater in size and/orvolume than a second structure, the first structure may be over thesecond structure and may be considered as covering a substantial portionof the second structure by the nature of the first structure coveringmore area and/or volume than the second structure and/or wherein thefirst structure at least partially exceeds beyond an edge or boundary ofthe second structure. Furthermore, in some embodiments, substantial alsomay refer to a portion that is less than 50%, for example where theportion is ample or sufficient in quality and/or quantity. In yet otherembodiments, substantial may mean all or nearly all. It should be noted,however, that the scope of the disclosure and/or the claimed subjectmatter is not limited in this respect.

FIGS. 2A to 2L show cross-sectional views of an example method formanufacturing semiconductor device 100. FIG. 2A shows a cross-sectionalview of semiconductor device 100 at an early stage of manufacture.

In the example shown in FIG. 2A, substrate 110 can comprise one or moreconductive layers of conductive structure 111 and one or more dielectriclayers of conductive structure 112. Substrate 110 can comprise, forexample, a printed circuit board (e.g., a prebuilt laminate circuitstructure having a core), or a leadframe. In other examples, substrate110 can comprise a high-density fan-out structure (HDFO) or buildupredistribution structure such as, for example, a SLIM (Silicon-LessIntegrated Module) or SWIFT (Silicon Wafer Integrated Fan-outTechnology) structure. In some examples, substrate 110 can comprise adielectric layer of dielectric structure 112 for electrically isolatingneighboring conductive layers of conductive structure 111 from eachother. Substrate 110 can be formed to have a build-up structure in whichrespective layers of conductive structure 111 and of dielectricstructure 112 are sequentially and/or repeatedly formed.

Conductive structure 111 can be exposed to the outside through top andbottom surfaces of substrate 110. Electronic device 120 can beelectrically connected to a conductive layer of conductive structure 111exposed to a top surface of substrate 110, and interconnects 160 can beelectrically connected to a conductive layer of conductive structure 111exposed to the bottom surface of substrate 110.

In some examples, conductive structure 111 can be referred to as, or cancomprise, a metal layer, a metal wiring layer, or a circuit pattern.Conductive structure 111 can comprise an electrically conductivematerial such as, for example, gold (Au), silver (Ag), copper (Cu),aluminum (Al), or palladium (Pd). Examples for forming conductive layer111 include using an electroplating process or a physical vapordeposition (PVD) process. The thickness of one or more layers ofconductive structure 111 can range from about 10 microns to about 20microns. Conductive layer 111 can provide an electrically conductivepath between electronic device 120 and interconnects 160.

In some examples, dielectric structure 112 can be referred to as aninsulator, or a passivation layer. Dielectric structure 112 can comprisean electrically insulating material such as, for example, oxide,nitride, polyimide, benzo cyclo butene, poly benzoxazole,bismaleimidetriazine (BT), phenolic resin, or epoxy. Examples forforming dielectric layer 112 can comprise thermal oxidation, chemicalvapor deposition (CVD), physical vapor deposition (PVD), atomic layerdeposition (ALD), low pressure chemical vapor deposition (LPCVD), plasmaenhanced chemical vapor deposition (PECVD), sheet lamination, orevaporating. The thickness of dielectric structure 112 can range fromabout 25 microns to about 100 microns. In some examples, dielectricstructure 112 can protect conductive structure 111 from environmentalexposure and dielectric structure 112 can provide electrical isolationbetween conductive elements in substrate 110.

FIG. 2B shows a cross-sectional view of semiconductor device 100 at alater stage of manufacture. In the example shown in FIG. 2B, electronicdevice 120 can be attached to a top portion of substrate 110. In someexamples, electronic device 120 can comprise a semiconductor die. Insome examples, semiconductor die 120 can comprise a semiconductormaterial such as, for example, silicon (Si). Semiconductor die 120 cancomprise passive electronic circuit elements (not shown) or activeelectronic circuit elements (not shown) such as transistors.Semiconductor die 120 can comprise interconnects 121. In some examples,interconnects 121 can be referred to as conductive bumps, conductiveballs, such as solder balls, conductive pillars, such as copper pillars,or conductive posts, such as copper posts. The thickness ofinterconnects 121 can range from about 40 microns to about 100 microns.

In addition, although only one semiconductor die 120 is shown in FIG.2B, this is not a limitation of the present disclosure. In otherexamples, more than one semiconductor die 120 can be attached to the topportion of substrate 110. In some examples, semiconductor die 120 cancomprise, an electrical circuit, such as a digital signal processor(DSP), a microprocessor, a network processor, a power managementprocessor, an audio processor, a radio frequency (RF) circuit, awireless baseband system-on-chip (SoC) processor, a sensor or anapplication specific integrated circuit. Semiconductor die 120 can beattached to the top portion of substrate 110 by electrically connectingconductive bumps 121 to conductive structure 111 exposed at the topsurface of substrate 110. In some examples, semiconductor die 120 can beelectrically connected to conductive structure 111 by a mass reflowprocess, a thermal compression process or a laser bonding process.

FIG. 2C shows a cross-sectional view of semiconductor device 100 at alater stage of manufacture. In the example shown in FIG. 2C, array 20and corresponding cover 140 can be attached to the top portion ofsemiconductor die 120 using an adhesion material 21. Adhesion material21 can thus serve as interface between cover 140 and the top ofsemiconductor die 120, and as seen in the present example, can alsocover at least a portion of the sidewall of semiconductor die 120. Insome examples, the adhesion material 21 can comprise a thermal interfacematerial (TIM). TIM 21 can be formed between semiconductor die 120 andarray 20. TIM 21 can include a high thermal conductivity filler (e.g.,aluminum nitride (AlN), boron nitride (BN), alumina (Al₂O₃), siliconcarbide (SiC), etc.), a binder or adhesive (e.g., a polymer resin)and/or additives. TIM 21 can have a thermal conductivity in the rangefrom approximately 5 w/m·k to approximately 100 w/m·k. TIM 21 can beformed or applied by a variety of methods, including spraying, dipping,injection, or silk screen coating. The thickness of TIM 21 can rangefrom about 30 microns to about 50 microns. In some examples, TIM 21 cantransfer the heat generated from semiconductor die 120 to array 20. Insome embodiments as shown in FIG. 2C and in various other figures, TIM21 can extend to one or more ends of semiconductor die 120, and on otherembodiments may extend beyond and/or over one or more ends, edges, orcorners of semiconductor die 120, and the scope of the disclosure and/orthe claims is not limited in this respect. In some examples, array 20can comprise cover 140 and casing 150. In some examples, cover 140 canbe referred to as a heat radiation member. In some embodiments, cover140 can comprise a generally planar heat radiation member. It should benoted that the term “planar” may refer to a surface that is planar ornearly planar within an acceptable tolerance. It should be noted,however, that the scope of the disclosure and/or the claimed subjectmatter is not limited in this respect.

In some examples, casing 150 can be referred to as a resin portion. Inone or more embodiments as will be discussed in further detail below,casing 150 may be disposed around the periphery of cover 140. In someembodiments, cover 140 may have four sides, and casing 150 may cover allfour sides of cover 140 in a contiguous manner, or may nearly cover allfour sides of cover 140 in a contiguous or non-contiguous manner, forexample wherein casing 150 may have one or more of a notch, slot, orgroove, or other structure, that may prevent casing 150 from completelycovering all four sides of cover 140 and/or an entire periphery of cover140, and the scope of the disclose and/or the claimed subject matter isnot limited in this respect. Before describing the attaching of array20, a process of forming array 20 will first be described.

In the example shown in FIG. 2D, a plurality of covers 140 can bearranged on a mold or carrier 10, leaving a groove or spacing betweenthe covers 140 at a constant interval. In some examples, cover 140 canbe attached to mold or carrier 10 using an adhesion material (notshown). In some examples, cover 140 can comprise a thermally conductivemetal having good thermal conductivity, for example, copper (Cu),aluminum (Al), gold (Au), or silver (Ag). In some embodiments, cover 140can comprise a generally planar thermally conductive metal. It should benoted that the term “planar” may refer to a surface that is planar ornearly planar within an acceptable tolerance. It should be noted,however, that the scope of the disclosure and/or the claimed subjectmatter is not limited in this respect. The thickness of cover 140 canrange from about 200 microns to about 400 microns. Next, in the exampleshown in FIG. 2E, gel-type resin can be poured into regions between eachof the plurality of covers 140 and can be cured by an annealing process,thereby forming casing 150. In other example shown in FIG. 2F, a resinsheet 150′ can be positioned on the plurality of covers 140. Resin sheet150′ can be in a semi-curable state. Next, in the example shown in FIG.2G, resin sheet 150′ can be positioned between each of the plurality ofcovers 140 by pressure and cured by an annealing process, therebyforming casing 150. In some examples, casing 150 can comprise an epoxy,a phenolic resin, a glass epoxy, polymer, polyimide, polyester, siliconeor ceramic. The thickness of casing 150 can range from about 200 micronsto about 400 microns. Therefore, casing 150 connects covers 140 to oneanother. Then, in the example shown in FIG. 2H, the plurality of covers140 and casing 150 are separated from mold or carrier 10, therebycompleting array 20.

Array 20, in the example shown in FIG. 2I, the plurality of covers 140can be arranged to be spaced apart at a constant interval from eachother and casing 150 can be formed between each of the plurality ofcovers 140, so that array 20 can be configured in the form of a plate.Since array 20 allows individual steps of arranging the respectivecovers 140 on semiconductor die 120 to be skipped, the productivity canbe improved. In some examples, in a state in which a plurality ofsemiconductor die 120 are attached to the top portion of substrate 110,the respective covers 140 can be attached to the plurality ofsemiconductor die 120 through attachment of single array 20, therebyimproving the productivity. A plurality of arrays 20 can be attachedaccording to the size of substrate 110 and the number of semiconductordie 120. In some embodiments, one or more covers 140 may have foursides, and casing 150 may cover all four sides of a cover 140 in acontiguous manner, or may nearly cover all four sides of a cover 140 ina contiguous or non-contiguous manner, for example wherein casing 150may have one or more of a notch, slot, or groove, or other structurethat may prevent casing 150 from completely covering all four sides ofcover 140 and/or an entire periphery of cover 140, and the scope of thedisclosure and/or the claimed subject matter is not limited in thisrespect.

Returning to FIG. 2C, some portion of cover 140 in array 20 can becoupled to the top surface of semiconductor die 120. In some examples,an area of cover 140 can be larger than the area of semiconductor die120 and smaller than the area of substrate 110. In some examples, cover140 can be formed to cover semiconductor die 120 and a portion ofsubstrate 110 can be exposed to the outside of cover 140. Therefore, itis unnecessary to form adhesion material 21 on the entire bottom surfaceof array 20. Rather, adhesion material 21 can be formed on only aportion of cover 140 corresponding to semiconductor die 120, therebysaving the cost associated with the formation of adhesion material 21.In addition, since cover 140 has a larger area than semiconductor die120, the heat generated from semiconductor die 120 can be rapidlyradiated to the outside. In some examples, casing 150 can be formed tosurround side surfaces of cover 140. Therefore, a top surface of cover140 can be exposed to the outside and rapidly radiates the heatgenerated from semiconductor die 120 to the outside.

Moving now to FIG. 2J, a cross-sectional view of semiconductor device100 is shown at a later stage of manufacture. In the example shown inFIG. 2J, encapsulant 130 can be formed between substrate 110 and array20. Encapsulant 130 encapsulates semiconductor die 120 and a top portionof substrate 110. In some examples, encapsulant 130 can contact side andbottom surfaces of semiconductor die 120 and not contact the top surfaceof semiconductor die 120. In some examples, encapsulant 130 can compriseany one of various encapsulating or molding materials, for example, aresin, a polymer compound, a polymer having a filler, an epoxy resin, anepoxy resin having a filler, epoxy acrylate having a filler, a siliconematerial, combinations thereof or and equivalents thereof. In someexamples, encapsulant 130 can be formed by one of various methods, forexample, a compression molding process, a liquid phase encapsulantmolding process, a vacuum lamination process, a paste printing process,or a film assisted molding process. The thickness of encapsulant 130 canrange from about 120 microns to about 200 microns. In some examples,encapsulant 130 can be injected into a region between substrate 110 andarray 20 and cured, thereby encapsulating semiconductor die 120.

In some examples, as shown in FIG. 2K, substrate 110, semiconductor die120 and array 20 can be placed in a mold and encapsulant 130 can beinjected into the mold through a molding inlet 30, thereby encapsulatingsemiconductor die 120. In some examples, encapsulant 130 can protectsemiconductor die 120 from external environments. There can be exampleswhere casing 150 can comprise similar materials and/or can be formed bya process similar to one or more of those described with respect toencapsulant 130.

FIG. 2L shows a cross-sectional view of semiconductor device 100 at alater stage of manufacture. In the example shown in FIG. 2L, substrate110, array 20 and encapsulant 130 can be subjected to a singulationoperation to separate each of the plurality of semiconductor die 120 andeach of the plurality of covers 140. In some examples, substrate 110,casing 150 and encapsulant 130 can be separated by means of a sawingtool. In some examples, before singulating substrate 110, array 20 andencapsulant 130, interconnects 160 can be attached to conductivestructure 111 exposed at the bottom surface of substrate 110. In otherexamples, interconnects 160 can be attached to conductive structure 111exposed at the bottom surface of substrate 110 after the sawing. Forexample, interconnects 160 can be formed as a ball grid array, a landgrid array, or a pin grid array. In addition, interconnects 160 cancomprise tin (Sn), silver (Ag), lead (Pb), copper (Cu), Sn—Pb, Sn₃₇–Pb,Sn₉₅—Pb, Sn—Pb—Ag, Sn—Cu, Sn—Ag, Sn—Au, Sn—Bi, or Sn—Ag—Cu. Examples forforming interconnects 160 include using a ball drop process, ascreen-printing process, or an electroplating process. The thickness ofinterconnects 160 can range from about 150 microns to about 300 microns.Interconnects 160 can serve as electrical contacts for providingelectrical signals between substrate 110 and external electricalcomponents (not shown).

The completed semiconductor device 100 can comprise substrate 110,semiconductor die 120 mounted on substrate 110, encapsulant 130encapsulating semiconductor die 120, cover 140 attached to the topportion of semiconductor die 120, casing 150 surrounding side surfacesof cover 140, and interconnects 160 attached to the bottom surface ofsubstrate 110.

FIGS. 3A to 3D show cross-sectional views of another example method formanufacturing semiconductor device 100. In the example shown in FIG. 3A,electronic device 120 can be attached to a top portion of substrate 110.In some examples, electronic device 120 can comprise a semiconductordie. In some examples, semiconductor die 120 can comprise asemiconductor material such as, for example, silicon (Si). Semiconductordie 120 can comprise passive electronic circuit elements (not shown) oractive electronic circuit elements (not shown) such as transistors.Semiconductor die 120 can comprise interconnects 121. In some examples,interconnects 121 can be referred to as conductive bumps, conductiveballs, such as solder balls, conductive pillars, such as copper pillars,or conductive posts, such as copper posts.

In addition, although only one semiconductor die 120 is shown in FIG.3A, this is not a limitation of the present disclosure. In otherexamples, more than one semiconductor die 120 can be attached to the topportion of substrate 110. Semiconductor die 120 can be attached to thetop portion of substrate 110 by electrically connecting conductive bumps121 to conductive structure 111 exposed at the top surface of substrate110. In some examples, semiconductor die 120 can be electricallyconnected to conductive structure 111 by a mass reflow process, athermal compression process or a laser bonding process.

FIG. 3B shows a cross-sectional view of semiconductor device 100 at alater stage of manufacture. In the example shown in FIG. 3B, encapsulant130 can be formed at the side surfaces of semiconductor die 120.Encapsulant 130 encapsulates semiconductor die 120 and the top portionof substrate 110. In addition, encapsulant 130 can expose the topsurface of semiconductor die 120 to the outside. In some examples,encapsulant 130 can contact side and bottom surfaces of semiconductordie 120 and not contact the top surface of semiconductor die 120. Insome examples, encapsulant 130 can comprise any one of variousencapsulating or molding materials, for example, a resin, a polymercompound, a polymer having a filler, an epoxy resin, an epoxy resinhaving a filler, epoxy acrylate having a filler, a silicon resin,combinations thereof or and equivalents thereof. In some examples,encapsulant 130 can be formed by one of various methods, for example, acompression molding process, a liquid phase encapsulant molding process,a vacuum lamination process, a paste printing process, or a filmassisted molding process.

FIG. 3C shows a cross-sectional view of semiconductor device 100 at alater stage of manufacture. In the example shown in FIG. 3C, array 20and corresponding cover 140 can be attached to the top portion ofsemiconductor die 120 and encapsulant 130 using an adhesion material 21,22. Adhesion material 21,22 can thus serve as interface between cover140 and the top of semiconductor die 120. In some examples, adhesionmaterial 21, 22 can comprise a thermal interface material (TIM) 21 andan adhesive 22. The adhesion material, whether TIM 21 and/or adhesive22, can in some examples also extend to cover at least a portion of thesidewall of semiconductor die 120. TIM 21 can be formed betweensemiconductor die 120 and array 20. TIM 21 can include a high thermalconductivity filler (e.g., aluminum nitride (AlN), boron nitride (BN),alumina (Al₂O₃), silicon carbide (SiC), etc.), a binder or adhesive(e.g., a polymer resin) and/or additives. TIM 21 can have a thermalconductivity in the range from approximately 5 w/m·k to approximately100 w/m·k. TIM 21 can be formed or applied by a variety of methods,including spraying, dipping, injection, or silk screen coating. Thethickness of TIM 21 can range from about 30 microns to about 50 microns.In some examples, TIM 21 can transfer the heat generated fromsemiconductor die 120 to array 20. Adhesive 22 can be formed betweenencapsulant 130 and array 20. The thickness of adhesive 22 can rangefrom about 30 microns to about 50 microns. Adhesive 22 can contactencapsulant 130 and array 20. In addition, the thermal conductivity ofTIM 21 can be greater than the thermal conductivity of adhesive 22.There can be examples where TIM 21 and adhesive 22 can comprise a sameand/or continuous material. In some examples, array 20 can comprisecover 140 and casing 150. In some examples, cover 140 can be referred toas a heat radiation member. In some examples, casing 150 can be referredto as a resin portion. Process for forming array 20 is shown in FIGS. 2Dto 2I.

In the example shown in FIG. 3C, some portion of cover 140 in array 20can be coupled to the top surface of semiconductor die 120. In someexamples, an area of cover 140 can be larger than that of semiconductordie 120 and smaller than substrate 110. In addition, since cover 140 hasa larger area than semiconductor die 120, the heat generated fromsemiconductor die 120 can be rapidly radiated to the outside. In someexamples, casing 150 can be formed to surround side surfaces of cover140. Therefore, a top surface of cover 140 can be exposed to the outsideand rapidly radiates the heat generated from semiconductor die 120 tothe outside.

FIG. 3D shows a cross-sectional view of semiconductor device 100 at alater stage of manufacture. In the example shown in FIG. 3D, substrate110, array 20 and encapsulant 130 can be subjected to a sawing operationto separate each of the plurality of semiconductor die 120 and each ofthe plurality of covers 140. In some examples, substrate 110, casing 150and encapsulant 130 can be separated by means of a sawing tool. In someexamples, before sawing substrate 110, array 20 and encapsulant 130,interconnects 160 can be attached to conductive structure 111 exposed atthe bottom surface of substrate 110. In other examples, interconnects160 can be attached to conductive structure 111 exposed at the bottomsurface of substrate 110 after the sawing. For example, interconnects160 can be formed as a ball grid array, a land grid array, or a pin gridarray. In addition, interconnects 160 can comprise tin (Sn), silver(Ag), lead (Pb), copper (Cu), Sn—Pb, Sn₃₇—Pb, Sn₉₅—Pb, Sn—Pb—Ag, Sn—Cu,Sn—Ag, Sn—Au, Sn—Bi, or Sn—Ag—Cu. Examples for forming interconnects 160include using a ball drop process, a screen-printing process, or anelectroplating process.

The completed semiconductor device 100 can comprise substrate 110,semiconductor die 120 mounted on substrate 110, encapsulant 130encapsulating semiconductor die 120, cover 140 attached to the topportion of semiconductor die 120, casing 150 surrounding side surfacesof cover 140, and interconnects 160 attached to the bottom surface ofsubstrate 110.

FIG. 4 shows a cross-sectional view of another example of asemiconductor device 200. Semiconductor device 200 can be similar tosemiconductor device 100. Semiconductor device 200 can comprise casing250 formed on the top surface of cover 140. Casing 250 can protect tothe top surface of cover 140.

FIGS. 5A to 5L show cross-sectional views of another example method formanufacturing semiconductor device 200. FIG. 5A shows a cross-sectionalview of semiconductor device 200 at an early stage of manufacture.

In the example shown in FIG. 5A, substrate 110 can comprise one or moreconductive layers of conductive structure 111 and one or more dielectriclayers of dielectric structure 112. Substrate 110 can comprise, forexample, a printed circuit board (e.g., a prebuilt laminate circuitstructure having a core), or a leadframe. In other examples, substrate110 can comprise a high-density fan-out structure (HDFO) or buildupredistribution structure such as, for example, a SLIM (Silicon-LessIntegrated Module) or SWIFT (Silicon Wafer Integrated Fan-outTechnology) structure. In some examples, substrate 110 can comprise adielectric layer of dielectric structure 112 for electrically isolatingneighboring conductive layers of conductive structure 111 from eachother. Substrate 110 can be formed to have a build-up structure in whichrespective layers of conductive structure 111 and dielectric structure112 are repeatedly or sequentially formed.

Conductive structure 111 can be exposed to the outside through top andbottom surfaces of substrate 110. Electronic device 120 can beelectrically connected to a conductive layer of conductive structure 111exposed to a top surface of substrate 110, and interconnects 160 can beelectrically connected to a conductive layer of conductive structure 111exposed to the bottom surface of the substrate 110.

In some examples, conductive structure 111 can be referred to as, or cancomprise, a metal layer, a metal wiring layer, or a circuit pattern.Conductive structure 111 can comprise an electrically conductivematerial such as, for example, gold (Au), silver (Ag), copper (Cu),aluminum (Al), or palladium (Pd). Example for forming conductivestructure 111 includes using an electroplating process or a physicalvapor deposition (PVD) process. Conductive structure 111 can connect tosubstrate 110 and electronic device 120. In addition, conductivestructure 111 can connect to substrate 110 and interconnects 160.

In some examples, dielectric structure 112 can be referred to as aninsulator, or a passivation layer. Dielectric structure 112 can comprisean electrically insulating material such as, for example, oxide,nitride, polyimide, benzo cyclo butene, poly benz oxazole,bismaleimidetriazine (BT), phenolic resin, or epoxy. Examples forforming dielectric structure 112 can comprise thermal oxidation,chemical vapor deposition (CVD), physical vapor deposition (PVD), atomiclayer deposition (ALD), low pressure chemical vapor deposition (LPCVD),plasma enhanced chemical vapor deposition (PECVD), sheet lamination, orevaporating. In some examples, dielectric structure 112 can protectconductive structure 111 from environmental exposure and dielectricstructure 112 can provide electrical isolation between conductiveelements in substrate 110.

FIG. 5B shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 5B, electronicdevice 120 can be attached to a top portion of substrate 110. In someexamples, electronic device 120 can comprise a semiconductor die. Insome examples, semiconductor die 120 can comprise a semiconductormaterial such as, for example, silicon (Si). Semiconductor die 120 cancomprise passive electronic circuit elements (not shown) or activeelectronic circuit elements (not shown) such as transistors.Semiconductor die 120 can comprise interconnects 121. In some examples,interconnects 121 can be referred to as conductive bumps, conductiveballs, such as solder balls, conductive pillars, such as copper pillars,or conductive posts, such as copper posts.

In addition, although only one semiconductor die 120 is shown in FIG.5B, this is not a limitation of the present disclosure. In otherexamples, more than one semiconductor die 120 can be attached to the topportion of substrate 110. In some examples, semiconductor die 120 cancomprise, an electrical circuit, such as a digital signal processor(DSP), a microprocessor, a network processor, a power managementprocessor, an audio processor, a radio frequency (RF) circuit, awireless baseband system-on-chip (SoC) processor, a sensor or anapplication specific integrated circuit. Semiconductor die 120 can beattached to the top portion of substrate 110 by electrically connectingconductive bumps 121 to conductive structure 111 exposed to the topsurface of substrate 110. In some examples, semiconductor die 120 can beelectrically connected to conductive structure 111 by a mass reflowprocess, a thermal compression process or a laser bonding process.

FIG. 5C shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 5C, array 20′can be attached to the top portion of semiconductor die 120 using anadhesion material 21.

In some examples, adhesion material 21 can comprise a thermal interfacematerial (TIM). TIM 21 can be formed between semiconductor die 120 andarray 20′. TIM 21 can include a high thermal conductivity filler (e.g.,aluminum nitride (AlN), boron nitride (BN), alumina (Al₂O₃), siliconcarbide (SiC), etc.), a binder or adhesive (e.g., a polymer resin)and/or additives. TIM 21 can have a thermal conductivity in the rangefrom approximately 5 w/m·k to approximately 100 w/m·k. TIM 21 can beformed or applied by a variety of methods, including spraying, dipping,injection, or silk screen coating. The thickness of TIM 21 can rangefrom about 30 microns to about 50 microns.

In some examples, TIM 21 can transfer the heat generated fromsemiconductor die 120 to array 20′. In some examples, array 20′ cancomprise cover 140 and casing 250. In some examples, cover 140 can bereferred to as a heat radiation member. In some examples, casing 250 canbe referred to as a resin portion. Before describing the attaching ofarray 20′, a process of forming array 20′ will first be described.

In the example shown in FIG. 5D, a plurality of covers 140 can bearranged on a carrier 40 at a constant interval. In some examples, cover140 can be attached to carrier 40 using an adhesion material (notshown). In some examples, carrier 40 can comprise a metal, silicon (Si)or glass. In some examples, cover 140 can comprise a thermallyconductive metal having good thermal conductivity, for example, copper(Cu), aluminum (Al), gold (Au), or silver (Ag). The thickness of cover140 can range from about 200 microns to about 400 microns. Next, in theexample shown in FIG. 5E, casing 250 can be formed by placing carrier 40having covers 140 arranged on a mold (not shown) and injecting an epoxymolding compound (EMC) into the mold. In other example shown in FIG. 5F,a resin sheet 250′ can be positioned on the plurality of covers 140.Resin sheet 250′ can be semi-curable state. Next, in the example shownin FIG. 5G, resin sheet 250′ can be positioned between each of theplurality of covers 140 by pressure and cured by an annealing process,thereby forming casing 250. In some examples, casing 250 can comprise anepoxy, a phenolic resin, a glass epoxy, polymer, polyimide, polyester,silicon or ceramic. The thickness of casing 250 can range from about 300microns to about 500 microns. Therefore, casing 250 connects covers 140to one another. Then, in the example shown in FIG. 5H, carrier 40 can beeliminated, thereby completing array 20′ including the plurality ofcovers 140 and casing 250. Since the side and top surfaces of covers 140of array 20′ can be covered by casing 250, an unnecessary electricalcontact between array 20′ and an external circuit can be prevented.

Array 20′, in the example shown in FIG. 51, the plurality of covers 140can be arranged to be spaced apart at a constant interval from eachother and casing 250 can be formed between each of the plurality ofcovers 140, so that array 20′ can be configured in the form of a plate.Since array 20′ allows individual steps of arranging the respectivecovers 140 on semiconductor die 120 to be skipped, the productivity canbe improved. In some examples, in a state in which a plurality ofsemiconductor die 120 are attached to the top portion of substrate 110,the respective covers 140 can be attached to the plurality ofsemiconductor die 120 through attachment of single array 20′, therebyimproving the productivity. A plurality of arrays 20′ can be attachedaccording to the size of substrate 110 and the number of semiconductordie 120.

In the example shown in FIG. 5C, some portion of cover 140 in array 20′can be contacted to the top surface of semiconductor die 120. In someexamples, an area of cover 140 can be larger than that of semiconductordie 120 and smaller than substrate 110. In some examples, cover 140 canbe formed to cover semiconductor die 120 and a portion of substrate 110can be exposed to the outside of cover 140. Therefore, it is unnecessaryto form adhesion material 21 on the entire bottom surface of array 20′.Rather, adhesion material 21 can be formed on only a portion of cover140 corresponding to semiconductor die 120, thereby saving the costassociated with the formation of adhesion material 21. In addition,since cover 140 has a larger area than semiconductor die 120, the heatgenerated from semiconductor die 120 can be rapidly radiated to theoutside. In some examples, casing 250 can be formed to surround side andtop surfaces of cover 140. Therefore, casing 250 can prevent electricalcontact between array 20′ and an external circuit.

FIG. 5J shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 5J, encapsulant130 can be formed between substrate 110 and array 20′. Encapsulant 130encapsulates semiconductor die 120 from a top portion of substrate 110.In some examples, encapsulant 130 can contact side and bottom surfacesof semiconductor die 120 and not contact the top surface ofsemiconductor die 120. In some examples, encapsulant 130 can compriseany one of various encapsulating or molding materials, for example, aresin, a polymer compound, a polymer having a filler, an epoxy resin, anepoxy resin having a filler, epoxy acrylate having a filler, a siliconresin, combinations thereof or and equivalents thereof. In someexamples, encapsulant 130 can be formed by one of various methods, forexample, a compression molding process, a liquid phase encapsulantmolding process, a vacuum lamination process, a paste printing process,or a film assisted molding process. In some examples, encapsulant 130can be injected into a region between substrate 110 and array 20′ andcured, thereby encapsulating semiconductor die 120.

For example, as shown in FIG. 5K substrate 110, semiconductor die 120and array 20′ can be placed in a mold and encapsulant 130 can beinjected into the mold through a molding inlet 30, thereby encapsulatingsemiconductor die 120. In some examples, encapsulant 130 can protectsemiconductor die 120 from external environments.

FIG. 5L shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 5L, substrate110, array 20′ and encapsulant 130 can be subjected to a sawingoperation to separate each of the plurality of semiconductor die 120 andeach of the plurality of covers 140. In some examples, substrate 110,casing 250 and encapsulant 130 can be separated by means of a sawingtool. In some examples, before sawing substrate 110, array 20′ andencapsulant 130, interconnects 160 can be attached to conductivestructure 111 exposed to the bottom surface of substrate 110. In otherexamples, interconnects 160 can be attached to conductive structure 111exposed to the bottom surface of substrate 110 after the sawing. Forexample, interconnects 160 can be formed as a ball grid array, a landgrid array, or a pin grid array. In addition, interconnects 160 cancomprise tin (Sn), silver (Ag), lead (Pb), copper (Cu), Sn—Pb, Sn₃₇—Pb,Sn₉₅—Pb, Sn—Pb—Ag, Sn—Cu, Sn—Ag, Sn—Au, Sn—Bi, or Sn—Ag—Cu. Examples forforming interconnects 160 include using a ball drop process, ascreen-printing process, or an electroplating process.

The completed semiconductor device 200 can comprise substrate 110,semiconductor die 120 mounted on substrate 110, encapsulant 130encapsulating semiconductor die 120, cover 140 attached to the topportion of semiconductor die 120, casing 250 surrounding side and topsurfaces of cover 140, and interconnects 160 attached to the bottomsurface of substrate 110.

FIGS. 6A to 6D show cross-sectional views of another example method formanufacturing semiconductor device 200. In the example shown in FIG. 6A,electronic device 120 can be attached to a top portion of substrate 110.In some examples, electronic device 120 can comprise a semiconductordie. In some examples, semiconductor die 120 can comprise asemiconductor material such as, for example, silicon (Si). Semiconductordie 120 can comprise passive electronic circuit elements (not shown) oractive electronic circuit elements (not shown) such as transistors.Semiconductor die 120 can comprise interconnects 121. In some examples,interconnects 121 can be referred to as conductive bumps, conductiveballs, such as solder balls, conductive pillars, such as copper pillars,or conductive posts, such as copper posts.

In addition, although only one semiconductor die 120 is shown in FIG.6A, this is not a limitation of the present disclosure. In otherexamples, more than one semiconductor die 120 can be attached to the topportion of substrate 110. Semiconductor die 120 can be attached to thetop portion of substrate 110 by electrically connecting conductive bumps121 to conductive structure 111 exposed to the top surface of substrate110. In some examples, semiconductor die 120 can be electricallyconnected to conductive structure 111 by a mass reflow process, athermal compression process or a laser bonding process.

FIG. 6B shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 6B, encapsulant130 can be formed at the side surfaces of semiconductor die 120.Encapsulant 130 encapsulates semiconductor die 120 from the top portionof substrate 110. In addition, encapsulant 130 can expose the topsurface of semiconductor die 120 to the outside. In some examples,encapsulant 130 can contact side and bottom surfaces of semiconductordie 120 and not contact the top surface of semiconductor die 120. Insome examples, encapsulant 130 can comprise any one of variousencapsulating or molding materials, for example, a resin, a polymercompound, a polymer having a filler, an epoxy resin, an epoxy resinhaving a filler, epoxy acrylate having a filler, a silicon resin,combinations thereof or and equivalents thereof. In some examples,encapsulant 130 can be formed by one of various methods, for example, acompression molding process, a liquid phase encapsulant molding process,a vacuum lamination process, a paste printing process, or a filmassisted molding process.

FIG. 6C shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 6C, array 20′can be attached to the top portion of semiconductor die 120 andencapsulant 130 using an adhesion material 21, 22. In some examples,adhesion material 21, 22 can comprise a thermal interface material (TIM)and adhesive 22. TIM 21 can be formed between semiconductor die 120 andarray 20′. TIM 21 can include a high thermal conductivity filler (e.g.,aluminum nitride (AlN), boron nitride (BN), alumina (Al₂O₃), siliconcarbide (SiC), etc.), a binder or adhesive (e.g., a polymer resin)and/or additives. TIM 21 can have a thermal conductivity in the rangefrom approximately 5 w/m·k to approximately 100 w/m·k. TIM 21 can beformed or applied by a variety of methods, including spraying, dipping,injection, or silk screen coating. The thickness of TIM 21 can rangefrom about 30 microns to about 50 microns. In some examples, TIM 21 cantransfer the heat generated from semiconductor die 120 to array 20′.Adhesive 22 can be formed between encapsulant 130 and array 20.

The thickness of adhesive 22 can range from about 30 microns to about 50microns. Adhesive 22 can contact encapsulant 130 and array 20. Inaddition, the thermal conductivity of TIM 21 can be greater than thethermal conductivity of adhesive 22. There can be examples where TIM 21and adhesive 22 can comprise a same and/or continuous material. In someexamples, array 20′ can comprise cover 140 and casing 150. In someexamples, cover 140 can be referred to as a heat radiation member. Insome examples, casing 150 can be referred to as a resin portion. Processfor forming array 20′ is shown in FIGS. 5D to 5G. In the example shownin FIG. 6C, some portion of cover 140 in array 20′ can be coupled to thetop surface of semiconductor die 120. In some examples, an area of cover140 can be larger than that of semiconductor die 120 and smaller thansubstrate 110. In addition, since cover 140 has a larger area thansemiconductor die 120, the heat generated from semiconductor die 120 canbe rapidly radiated to the outside. In some examples, casing 250 can beformed to surround side and top surfaces of cover 140. Therefore, casing250 can prevent electrical contact between the array 20′ and an externalcircuit.

FIG. 6D shows a cross-sectional view of semiconductor device 200 at alater stage of manufacture. In the example shown in FIG. 6D, substrate110, array 20′ and encapsulant 130 can be subjected to a sawingoperation to separate each of the plurality of semiconductor die 120 andeach of the plurality of covers 140. In some examples, substrate 110,casing 250 and encapsulant 130 can be separated by means of a sawingtool. In some examples, before sawing substrate 110, array 20′ andencapsulant 130, interconnects 160 can be attached to conductivestructure 111 exposed to the bottom surface of substrate 110. In otherexamples, interconnects 160 can be attached to conductive structure 111exposed at the bottom surface of substrate 110 after the sawing. Forexample, interconnects 160 can be formed as a ball grid array, a landgrid array, or a pin grid array. In addition, interconnects 160 cancomprise tin (Sn), silver (Ag), lead (Pb), copper (Cu), Sn—Pb, Sn₃₇—Pb,Sn₉₅—Pb, Sn—Pb—Ag, Sn—Cu, Sn—Ag, Sn—Au, Sn—Bi, or Sn—Ag—Cu. Examples forforming interconnects 160 include using a ball drop process, ascreen-printing process, or an electroplating process.

The completed semiconductor device 200 can comprise substrate 110,semiconductor die 120 mounted on substrate 110, encapsulant 130encapsulating semiconductor die 120, cover 140 attached to the topportion of semiconductor die 120, casing 250 surrounding side and topsurfaces of cover 140, and interconnects 160 attached to the bottomsurface of substrate 110.

In summary, a semiconductor package such as a flip-chip chip scalepackage (fcCSP) comprises a substrate having a top surface and a bottomsurface, an electronic device mounted on the top surface of thesubstrate and coupled to one or more interconnects on the bottom surfaceof the substrate, a cover over the electronic device and a substantialportion of the substrate, a casing around a periphery of the cover, andan encapsulant between the cover and the casing and the substrate,wherein the encapsulant is coplanar with one or more ends of thesubstrate and the casing.

Methods to form such a semiconductor package include attaching multiplecovers or lids to respective electronic devices or semiconductor die ofthe package by first forming an array of the covers or lids into a blockarray wherein the block array includes a casing that holds the covers orlids in the block array. The block array may then be attached to asubstrate having multiple electronic devices attached to the substratewherein one cover or lid in the block array covers a respectiveelectronic device. An encapsulant may be molded between the electronicdevices and the covers or lids, either before the block array isattached or after the block array is attached.

Individual semiconductor packages may be singulated from the resultingstructure, for example by sawing through the encapsulant in between thecovers. The singulated semiconductor packages may have a resultingstructure wherein the cover or lid covers the electronic device and asubstantial portion of the substrate, and the casing covers theremaining portion of the substrate around the periphery of the cover orlid.

In some embodiments, the casing and the cover or lid are coplanarwherein a surface of the cover or lid is exposed to the ambientenvironment. In other embodiments, the casing completely orsubstantially covers the cover or lid wherein the cover or lid is notexposed to the ambient environment. The cover or lid may function as aheat radiating device, and may comprise a thermally conductive metal, todissipate heat from the electronic device. In some embodiments, athermal interface material may be between the electronic device and thecover or lid.

The above example methods to form a semiconductor package allow multiplecovers to be attached to multiple electronic devices at a higher ratethan a pick in place or one-by-one method to result in a higher unit perhour manufacturing throughput. Furthermore, the resulting semiconductorpackages result in a semiconductor device that has a cover or lidcomprising a larger portion of the semiconductor device to enhancethermal dissipation of heat from the electronic devices of thesemiconductor packages. Forming the covers in a block array allows forsingulation of the individual semiconductor packages using a standardsawing process, allowing for smaller form factors of the individualsemiconductor packages.

The present disclosure includes reference to certain examples. It willbe understood, however, by those skilled in the art that various changesmay be made, and equivalents may be substituted, without departing fromthe scope of the disclosure. In addition, modifications may be made tothe disclosed examples without departing from the scope of the presentdisclosure. Therefore, it is intended that the present disclosure not belimited to the examples disclosed, but that the disclosure will includeall examples falling within the scope of the appended claims.

1. A semiconductor package, comprising: a substrate having a top surfaceand a bottom surface; an electronic device on the top surface of thesubstrate and coupled to one or more interconnects on the bottom surfaceof the substrate; a cover over the electronic device, wherein the coveris over a substantial portion of the substrate; a casing around aperiphery of the cover, wherein the casing comprises a non-metallicmaterial; and an encapsulant between the cover and the substrate, andbetween the casing and the substrate.
 2. The semiconductor package ofclaim 1, wherein the cover is over a majority of the substrate.
 3. Thesemiconductor package of claim 1, wherein the cover has four sides andthe casing covers all four sides.
 4. The semiconductor package of claim1, wherein the cover has four sides and the casing nearly covers allfour sides.
 5. The semiconductor package or claim 1, wherein a surfaceof the encapsulant is coplanar with a surface of the substrate and oneor more surfaces of the casing.
 6. The semiconductor package of claim 1,further comprising an adhesion material between the cover and theelectronic device.
 7. The semiconductor package of claim 1, furthercomprising a thermal interface material between the cover and theelectronic device.
 8. The semiconductor package of claim 1, wherein thecover comprises a generally planar heat radiation member.
 9. Thesemiconductor package of claim 1, wherein the cover comprises athermally conductive metal.
 10. The semiconductor package of claim 1,wherein a top surface of the cover is coplanar with a top surface of thecasing wherein the top surface of the cover is exposed.
 11. Thesemiconductor package of claim 1, wherein the casing is over the coverwherein the cover is not exposed.
 12. A method to form a semiconductorpackage, the method comprising: disposing two or more semiconductor dieon a top surface of a substrate; forming an encapsulant between thesemiconductor die on the top surface of the substrate; attaching anarray of covers over the two or more semiconductor die, and wherein acover of the array of covers is over one of the semiconductor die,wherein the array of covers includes a casing around a periphery of twoor more covers of the array of covers; attaching two or moreinterconnects to a bottom surface of the substrate to electricallycouple the semiconductor die to the interconnects via the substrate toform a subassembly of the two or more semiconductor die; and singulatingthe subassembly into individual semiconductor packages, wherein anindividual semiconductor package comprises a piece of substrate, a pieceof encapsulant, a piece of casing, and one semiconductor die; whereinone of the covers is over the one semiconductor die and a substantialportion of the piece of substrate, and one or more surfaces of the pieceof encapsulant are coplanar with one or more surfaces of the piece ofsubstrate and one or more surfaces of the piece of casing.
 13. Themethod of claim 12, wherein said attaching the array of covers over thetwo or more semiconductor die includes applying a thermal interfacematerial between the array of covers and the corresponding semiconductordie.
 14. The method of claim 12, wherein said singulating comprisessawing between adjacent covers in the array of covers through thecasing.
 15. The method of claim 12, wherein said forming is performedbefore said attaching the array of covers over the two or moresemiconductor die.
 16. The method of claim 12, wherein said forming isperformed after said attaching the array of covers over the two or moresemiconductor die.
 17. A method to form a semiconductor package, themethod comprising: attaching an array of covers on a substrate striphaving two or more semiconductor die, wherein a cover of the array ofcovers is over a semiconductor die of the substrate strip, and whereinthe array of covers includes a casing around a periphery of two or moreof the covers; forming an encapsulant between the two or moresemiconductor die; and singulating the substrate strip into two or moresemiconductor packages, wherein a semiconductor package comprises apiece of substrate, a piece of encapsulant, a piece of casing, and onesemiconductor die; wherein a cover of one of the semiconductor packagesis over the one semiconductor die of the semiconductor package and asubstantial portion of the piece of substrate, and wherein one or moresurfaces of the piece of encapsulant are coplanar with one or moresurfaces of the piece of substrate and one or more surfaces of the pieceof casing.
 18. The method of claim 17, wherein said singulatingcomprises sawing between adjacent covers in the array of covers throughthe casing.
 19. The method of claim 17, further comprising forming thearray of covers by pouring a casing material into regions between thetwo or more covers and curing the casing material to form the casinginto the block array.
 20. The method of clam 17, further comprisingforming the array of covers by disposing a resin sheet on the two ormore covers and applying pressure to and curing the resin sheet intoregions between the two or more covers to from the casing.